input只能输入数字和小数点，并且只能保留小数点后两位 - CSDN博客

1.给文本框添加一个onkeyup=’clearNoNum(this)’点击事件 
2.建立clearNoNum方法

function clearNoNum(obj) {
    obj.value = obj.value.replace(/[^\d.]/g,""); //清除"数字"和"."以外的字符
        obj.value = obj.value.replace(/^\./g,""); //验证第一个字符是数字而不是
        obj.value = obj.value.replace(/\.{2,}/g,"."); //只保留第一个. 清除多余的
        obj.value = obj.value.replace(".","$#$").replace(/\./g,"").replace("$#$",".");
        obj.value = obj.value.replace(/^(\-)*(\d+)\.(\d\d).*$/,'$1$2.$3'); //只能输入两个小数  

}  

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3将金额小写转换成大写

function onlyNumber1(input, n) {
    var ret = "";
    var number =input.value;
        if (number != ""&& number!=null&&number!="0") {
                var unit = "仟佰拾亿仟佰拾万仟佰拾元角分",
                str = "";
                number += "00";
                var point = number.indexOf('.');
                if (point >= 0) {
                    number = number.substring(0, point) + number.substr(point + 1, 2);
                }
                unit = unit.substr(unit.length - number.length);
                for (var i = 0; i < number.length; i++) {
                    str += '零壹贰叁肆伍陆柒捌玖'.charAt(number.charAt(i)) + unit.charAt(i);
                }
                ret = str.replace(/零(仟|佰|拾|角)/g, "零").replace(/(零)+/g, "零").replace(/零(万|亿|元)/g, "$1").replace(/(亿)万|(拾)/g, "$1$2").replace(/^元零?|零分/g, "").replace(/元$/g, "元") + "整";
        }
    var a = document.getElementsByName("MoneyCapital")[0].id;
    document.getElementById(a).value=ret;
    }  

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